Embedded Systems LogicMachine5 - Page 208

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13. 'writebits',
14. 'writemultiplebits',
15. 'writeregisters',
16. 'writemultipleregisters',
17. 'reportslaveid',
18. 'getcoils',
19. 'getdiscreteinputs',
20. 'getinputregisters',
21. 'getregisters',
22. 'setcoils',
23. 'setdiscreteinputs',
24. 'setinputregisters',
25. 'setregisters',
26. },
27. -- new connecton init
28. new =function()
29. require('rpc')
30. local mb =setmetatable({}, { __index = mbproxy })
31.
32. mb.slaveid =0
33. mb.rpc = rpc.client('127.0.0.1', 28002, 'mbproxy')
34.
35. for _, fn in ipairs(mbproxy.functions)do
36. mb[ fn ]=function(self, ...)
37. return mb:request(fn, ...)
38. end
39. end
40.
41. return mb
42. end
43. }
44.
45. -- set local slave id
46. function mbproxy:setslave(slaveid)
47. self.slaveid = slaveid
48. end
49.
50. -- send rpc request for a spefic function
51. function mbproxy:request(fn, ...)
52. local res, err = self.rpc:request({
53. fn = fn,
54. params ={ ... },
55. slaveid = self.slaveid or0,
56. })
57.
58. -- request error
59. if err then
60. return nil, err